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            <h1 class="post-title">Flutter中使用Device_Calendar库与Android_ios日历通讯</h1>
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        <date class="post-meta meta-date">
            2021年8月30日
        </date>
        
        <div class="post-meta">
            <span>|</span>
            
            <span class="meta-category"><a href='/categories/Flutter'>Flutter</a></span>
            
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        <div class="post-meta">
            <span id="busuanzi_container_page_pv">|<span id="busuanzi_value_page_pv"></span><span>
                    阅读</span></span>
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        <div class="post-content">
            <p>构建到 Roam 创建了一个&quot;device_calendar&quot;飞毛device_calendar/Dart 库，以便与移动设备日历进行通信(即添加、更新、检索、删除 Android/iOS 日历事件)。他们当前的 Github 页面包括一个示例应用程序， 实现库， 我建议查看。</p>
<p>他们的 Github 页面目前没有关于如何使用库的详细信息， 所以我想我会记录一些说明， 以节省其他人的一些时间。我会用我的应用程序作为示例来显示如何使用这个库。我的应用程序被称为<strong>MMA日历</strong>。它从 Web 检索未来的 MMA(混合武术)事件，并自动为用户创建/更新日历事件。</p>
<p>我的应用程序可以在下面的链接看到供参考 (请务必遵循我的 Github 😎)
<a href="https://github.com/patpatchpatrick/MMACalendarFlutter-v2">https://github.com/patpatchpatrick/MMACalendarFlutter-v2</a> <a href="https://github.com/patpatchpatrick/MMACalendarFlutter-v2-">-</a></p>
<ol>
<li>首先，有必要将包依赖性添加到<strong>pubspec.yaml</strong>文件依赖部分，这是任何其他飘动外部库所必需的</li>
</ol>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">dependencies:
  flutter:
    sdk: flutter

  device_calendar: <span style="color:#f92672">^</span><span style="color:#ae81ff">0.1</span>.<span style="color:#ae81ff">1</span>
</code></pre></div><p>2.日历使用的<strong>权限</strong>还必须添加到安卓系统 (**安卓磁.xml)<strong>和 iOS</strong>(Info.plist)**的相应文件中)</p>
<p><em>安卓清单：</em></p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#f92672">&lt;</span>uses<span style="color:#f92672">-</span>permission android:name<span style="color:#f92672">=</span><span style="color:#e6db74">&#34;android.permission.READ_CALENDAR&#34;</span> <span style="color:#f92672">/&gt;</span>
<span style="color:#f92672">&lt;</span>uses<span style="color:#f92672">-</span>permission android:name<span style="color:#f92672">=</span><span style="color:#e6db74">&#34;android.permission.WRITE_CALENDAR&#34;</span> <span style="color:#f92672">/&gt;</span>
</code></pre></div><p><em>信息.列表：</em></p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#f92672">&lt;</span>key<span style="color:#f92672">&gt;</span>NSCalendarsUsageDescription<span style="color:#f92672">&lt;/</span>key<span style="color:#f92672">&gt;</span>
<span style="color:#f92672">&lt;</span>string<span style="color:#f92672">&gt;</span>REASON_TO_USE_CALENDAR<span style="color:#f92672">&lt;/</span>string<span style="color:#f92672">&gt;</span>
</code></pre></div><p>3.确保将<strong>device_calendar</strong>包导入您目前正在处理的应用程序飞镖文件。在我的 MMA 日历应用程序中，我在我的主页.dart 文件和日历页中使用此库。dart 文件，因此我导入两个文件中的包</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:device_calendar/device_calendar.dart&#39;</span>;
</code></pre></div><p>4.在我的应用程序中，我在日历页中创建了一个日历页小部件。在创建此小部件时，我使用 Github device_calendar 示例应用程序作为参考，但稍微调整了它。我的日历页小部件包含一个列表视图，显示用户的日历列表。然后，用户可以选择要使用的日历(即应添加到 Web 查询的 MMA 事件的日历)。然后，当用户单击&quot;<strong>加载战斗并添加到日历</strong>&ldquo;按钮时，将自动为用户创建日历事件(或者如果以前创建事件，将更新日历事件)，可以如下所示。</p>
<p>
        <a data-fancybox="gallery" href="https://miro.medium.com/freeze/max/32/1*VsYo1PuaJvkEFtfEKXX2zA.gif?q=20">
            <img class="mx-auto" alt="img" src="https://miro.medium.com/freeze/max/32/1*VsYo1PuaJvkEFtfEKXX2zA.gif?q=20" />
        </a>
    </p>
<p>
        <a data-fancybox="gallery" href="https://miro.medium.com/max/320/1*VsYo1PuaJvkEFtfEKXX2zA.gif">
            <img class="mx-auto" alt="img" src="https://miro.medium.com/max/320/1*VsYo1PuaJvkEFtfEKXX2zA.gif" />
        </a>
    </p>
<p>应用中用户选择日历的示例</p>
<p>5.在与移动设备日历通信之前，您需要创建一个<strong>设备日历</strong>。当我构建我的日历页面小部件的状态 (<strong>日历页状态</strong>) 时， 我在构造器中创建了一个新的设备日历。我这样做是因为日历页小部件立即需要插件，以便与移动设备日历通信的方法可用。</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">
<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">CalendarPageState</span> <span style="color:#66d9ef">extends</span> State<span style="color:#f92672">&lt;</span>CalendarPage<span style="color:#f92672">&gt;</span> {
  DeviceCalendarPlugin _deviceCalendarPlugin;

  List<span style="color:#f92672">&lt;</span>Calendar<span style="color:#f92672">&gt;</span> _calendars;
  Calendar _selectedCalendar;


  CalendarPageState() {
    _deviceCalendarPlugin <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> DeviceCalendarPlugin();
  }

  <span style="color:#960050;background-color:#1e0010">@</span>override
  initState() {
    <span style="color:#66d9ef">super</span>.initState();
    _retrieveCalendars();
  }
</code></pre></div><p>6.您还将在上面注意到，在构建状态时创建<strong>设备卡伦达普卢金</strong>后，当状态初始化时(在过度的初始状态 () 方法中)，称为**_retrieveCalendars**方法。本质上，这里正在发生的事情，是在状态构建后立即从设备中检索日历列表。</p>
<p>在下面的代码中，您将看到**_retrieveCalendars**方法异步从设备中检索日历，并将**_calendars**对象(即**列表&lt;日历&gt;**对象)设置为日历列表。在此之前，您必须检查设备是否授予了适当的日历权限，如果没有，您必须请求从设备检索日历列表所需的日历权限。如果成功授予权限，则设备**日历()的检索日历()**方法可用于从移动设备检索日历列表(**列表&lt;日历&gt;)。**总之，当创建日历页小部件时，创建了一个新的设备日历，然后使用插件的检索日历()方法从设备中检索日历。</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">void</span> _retrieveCalendars() <span style="color:#66d9ef">async</span> {

    <span style="color:#66d9ef">try</span> {
      <span style="color:#66d9ef">var</span> permissionsGranted <span style="color:#f92672">=</span> <span style="color:#66d9ef">await</span> _deviceCalendarPlugin.hasPermissions();
      <span style="color:#66d9ef">if</span> (permissionsGranted.isSuccess <span style="color:#f92672">&amp;&amp;</span> <span style="color:#f92672">!</span>permissionsGranted.data) {
        permissionsGranted <span style="color:#f92672">=</span> <span style="color:#66d9ef">await</span> _deviceCalendarPlugin.requestPermissions();
        <span style="color:#66d9ef">if</span> (<span style="color:#f92672">!</span>permissionsGranted.isSuccess <span style="color:#f92672">||</span> <span style="color:#f92672">!</span>permissionsGranted.data) {
          <span style="color:#66d9ef">return</span>;
        }
      }

      <span style="color:#66d9ef">final</span> calendarsResult <span style="color:#f92672">=</span> <span style="color:#66d9ef">await</span> _deviceCalendarPlugin.retrieveCalendars();
      setState(() {
        _calendars <span style="color:#f92672">=</span> calendarsResult<span style="color:#f92672">?</span>.data;
      });
    } <span style="color:#66d9ef">catch</span> (e) {
      print(e);
    }
  }
</code></pre></div><p>7.在我们有日历列表后，我们可以开始使用它们！您有几个选项 - 您可以从日历中检索事件、添加事件、删除事件、更新事件等&hellip;</p>
<p>在我的 MMA 日历应用程序中， 我只添加和更新事件， 所以这就是我将专注于这里。如第 4 步所述，我的日历页小部件包含显示用户日历的<strong>ListView。<strong>此 ListView 还显示仅读取日历的锁图标(此代码全部附带device_calendar 示例应用)。ListView 内部有一个</strong>手势检测器，该检测器</strong>将获取使用列表视图索引选择的日历日历。然后，我创建了一个回调功能，将此日历 ID、日历名称和设备日历名称和设备日历返回到我的应用程序主页，以便它们可以在我的主页小部件中使用。我不会在这里深入探讨如何使用 Dart 中的回调的详细信息，但要总结一下，您只需在小部件 (主页) 中创建一个功能，并将该功能传递到您的子小部件 (日历页) 的构造器中。然后，您可以从孩子调用此回调功能，为家长提供所需的对象(例如日历、日历名、设备日历)。(这方面的一个例子可以在我的代码_calendarCallback函数中看到)。</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">new</span> ConstrainedBox(
            constraints: <span style="color:#66d9ef">new</span> BoxConstraints(maxHeight: <span style="color:#ae81ff">150.0</span>),
            child: <span style="color:#66d9ef">new</span> ListView.builder(
              itemCount: _calendars<span style="color:#f92672">?</span>.length <span style="color:#f92672">??</span> <span style="color:#ae81ff">0</span>,
              itemBuilder: (BuildContext context, <span style="color:#66d9ef">int</span> index) {
                <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> GestureDetector(
                  onTap: () {
                    setState(() {
                      _selectedCalendar <span style="color:#f92672">=</span> _calendars[index];
                      <span style="color:#66d9ef">this</span>.widget._calendarCallback(_selectedCalendar.id, _selectedCalendar.name, _deviceCalendarPlugin);
                    });
                  },
                  child: <span style="color:#66d9ef">new</span> Padding(
                    padding: <span style="color:#66d9ef">const</span> EdgeInsets.all(<span style="color:#ae81ff">10.0</span>),
                    child: <span style="color:#66d9ef">new</span> Row(
                      children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
                        <span style="color:#66d9ef">new</span> Expanded(
                          flex: <span style="color:#ae81ff">1</span>,
                          child: <span style="color:#66d9ef">new</span> Text(
                            _calendars[index].name,
                            style: <span style="color:#66d9ef">new</span> TextStyle(fontSize: <span style="color:#ae81ff">25.0</span>),
                          ),
                        ),
                        <span style="color:#66d9ef">new</span> Icon(_calendars[index].isReadOnly
                            <span style="color:#f92672">?</span> Icons.lock
                            <span style="color:#f92672">:</span> Icons.lock_open, color: Colors.white,)
                      ],
                    ),
                  ),
                );
              },
            ),
          ),
</code></pre></div><p>8.通过主页小部件中的回调接收日历信息后，用户已正式选择日历，因此我启用了&rdquo;<strong>加载战斗并添加到日历</strong>&ldquo;按钮供用户选择。我还向用户显示选定的日历名称，这可以在应用程序的上述 GIF 中看到(在第 4 步)中。</p>
<p>当用户单击此负载战斗按钮时，MMA 事件数据将从 Web 中刮取，并创建 MMA 事件，这些事件可以添加到用户的移动设备日历中。我的代码使用一种称为**_addEventsToCalendar**的方法在用户日历中创建/更新事件。在用户日历中添加/更新事件相对直接。首先，您必须使用选定的日历 ID 作为构建器创建新**事件 (日历ID)。** 然后，您需要向活动添加某些数据(开始时间、持续时间、标题、描述等)。创建事件后，使用**设备日历**将其添加到用户日历中。安恩德完成了！您将通过您调用的事件创建方法收到结果变量(**创建事件结果**)。如果您的活动创建成功，**则创建事件成功。**</p>
<p>另一个重要注释，您的创建事件结果对象还将有一个数据字符串变量(**创建事件结果.data)，<strong>它对应于您在移动设备中创建的事件的 ID。如果需要，您可以使用此 ID 更新事件。要更新事件，您必须在事件上设置 ID 属性(即</strong>event.ID = 创建事件报告.data)。<strong>然后，当您在事件上调用</strong>创建或更新事件(事件)**方法时，它将被更新，而不是正在创建的新/重复事件。</p>
<p>我个人使用<strong>共享参考</strong>(shared_preferences 库)来处理我的活动 ID 。当我创建 MMA 事件时，我将事件名称/日期与 ID 关联，然后，如果用户已经拥有与事件相关的 ID，则我确保更新事件，而不是在其日历中创建新的/重复事件。</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">Future _addEventsToCalendar(List<span style="color:#f92672">&lt;</span>MMAEvent<span style="color:#f92672">&gt;</span> mmaEvents) <span style="color:#66d9ef">async</span> {
    <span style="color:#75715e">//Method to add events to the user&#39;s calendar
</span><span style="color:#75715e"></span>    <span style="color:#75715e">//If called, the list of mmaEvents will be iterated through and the mma
</span><span style="color:#75715e"></span>    <span style="color:#75715e">// Events will be added to the user&#39;s selected calendar
</span><span style="color:#75715e"></span>
    <span style="color:#75715e">//If the events have previously been added by the user, they will have a
</span><span style="color:#75715e"></span>    <span style="color:#75715e">// shared preference key for the Event ID and the event will be UPDATED
</span><span style="color:#75715e"></span>    <span style="color:#75715e">// instead of CREATED
</span><span style="color:#75715e"></span>
    <span style="color:#75715e">//If events are successfully created/added, then the events that were
</span><span style="color:#75715e"></span>    <span style="color:#75715e">// CREATED/UPDATED will be displayed to the user in the status string
</span><span style="color:#75715e"></span>
    <span style="color:#66d9ef">var</span> fightString <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> StringBuffer(<span style="color:#e6db74">&#39;&#39;</span>);
    SharedPreferences prefs <span style="color:#f92672">=</span> <span style="color:#66d9ef">await</span> SharedPreferences.getInstance();

    <span style="color:#66d9ef">for</span> (<span style="color:#66d9ef">var</span> mmaEvent <span style="color:#66d9ef">in</span> mmaEvents) {
      <span style="color:#75715e">//Before adding MMA Event to calendar, check if it is ready for calendar
</span><span style="color:#75715e"></span>      <span style="color:#75715e">// (i.e. ensure it is properly formatted)
</span><span style="color:#75715e"></span>      <span style="color:#66d9ef">if</span> (mmaEvent.readyForCalendar) {
        <span style="color:#66d9ef">final</span> eventTime <span style="color:#f92672">=</span> mmaEvent.eventDate;
        <span style="color:#66d9ef">final</span> eventToCreate <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> Event(_currentCalendarID);
        eventToCreate.title <span style="color:#f92672">=</span> mmaEvent.eventName;
        eventToCreate.start <span style="color:#f92672">=</span> eventTime;
        eventToCreate.description <span style="color:#f92672">=</span> mmaEvent.eventFights.toString();
        <span style="color:#66d9ef">String</span> mmaEventId <span style="color:#f92672">=</span> prefs.getString(mmaEvent.getPrefKey());
        <span style="color:#66d9ef">if</span> (mmaEventId <span style="color:#f92672">!=</span> <span style="color:#66d9ef">null</span>) {
          eventToCreate.eventId <span style="color:#f92672">=</span> mmaEventId;
        }
        eventToCreate.end <span style="color:#f92672">=</span> eventTime.add(<span style="color:#66d9ef">new</span> Duration(hours: <span style="color:#ae81ff">3</span>));
        <span style="color:#66d9ef">final</span> createEventResult <span style="color:#f92672">=</span>
            <span style="color:#66d9ef">await</span> _deviceCalendarPlugin.createOrUpdateEvent(eventToCreate);
        <span style="color:#66d9ef">if</span> (createEventResult.isSuccess <span style="color:#f92672">&amp;&amp;</span>
            (createEventResult.data<span style="color:#f92672">?</span>.isNotEmpty <span style="color:#f92672">??</span> <span style="color:#66d9ef">false</span>)) {
          prefs.setString(mmaEvent.getPrefKey(), createEventResult.data);
          fightString.write(mmaEvent.eventName <span style="color:#f92672">+</span> <span style="color:#e6db74">&#39;</span><span style="color:#ae81ff">\n</span><span style="color:#e6db74">&#39;</span>);
        }
      }
    }
</code></pre></div><p>将以下<em><strong>几</strong></em>行添加到<em><strong>flutter_app_path/android/gradle.properties。</strong></em></p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">android.useAndroidX<span style="color:#f92672">=</span><span style="color:#66d9ef">true</span>
android.enableJetifier<span style="color:#f92672">=</span><span style="color:#66d9ef">true</span>
</code></pre></div>
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        <li><strong>原文作者：</strong><a rel="author" href="https://luckly.work/">luckly</a></li>
        <li style="word-break:break-all"><strong>原文链接：</strong><a href="https://luckly.work/post/flutter_package/flutter%E4%B8%AD%E4%BD%BF%E7%94%A8Device_Calendar%E5%BA%93%E4%B8%8EAndrroid/">https://luckly.work/post/flutter_package/flutter%E4%B8%AD%E4%BD%BF%E7%94%A8Device_Calendar%E5%BA%93%E4%B8%8EAndrroid/</a></li>
        <li><strong>版权声明：</strong>本作品采用<a rel="license" href="https://creativecommons.org/licenses/by-nc-nd/4.0/">知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议</a>进行许可，非商业转载请注明出处（作者，原文链接），商业转载请联系作者获得授权。</li>
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